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Gree · Heat pump

C3 Main board to fan drive communication fault

High severity Gree GMV6 Mini VRF

What the control is telling you

The outdoor main control cannot talk to one of its drive boards.

Applies to: Gree GMV6 Ultra Heat Mini VRF 36-60k (GMV-V..WL/C-T(U))

Likely causes

  • Compressor or fan motor fault pulling down the drive
  • Board fault

Test and repair steps

  1. Ohm-check the compressor and fan motors (equal windings, open to ground).
  2. If the motors are good, replace the outdoor control board.

Models that show this code

3 models in Gree GMV6 Mini VRF

GMV-V36WL/C-T(U)GMV-V48WL/C-T(U)GMV-V60WL/C-T(U)

Other codes on the same units

  • b6 Accumulator inlet sensor open or shorted (20K)
  • C0 Communication fault IDU/ODU/wired controller
  • C1 Main board to DC-DC controller communication fault
  • C2 Main board to compressor drive communication fault
  • C4 Missing indoor units
  • d1 Indoor main board fault
  • d3 Indoor return air sensor open or shorted (15K)
  • d4 Indoor coil inlet pipe sensor open or shorted (20K)

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Source: Gree GMV6 Ultra Heat Mini VRF 36-60k (GMV-V36-48-60WL-C-T(U)) service.pdf - section Chapter 3 Faults, 4.1 Error Indication. Summarized in our own words; check the original manual for your model.

Homeowner looking at this code? See what it means for you and when to call a technician.

For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.